Answer
The answer is three. Alois Hitler, father of Adolf Hitler, married three times in his lifetime. His first marriage was to Anna Glassl-Hörer, with whom he had one child. After Anna's death in 1907, he married Klara Pölzl, who gave birth to Adolf Hitler in 1889 and five other children. Following Klara's demise in 1907, Alois married his third wife, Hedwig Heidemann.